Method and apparatus for making wire-drawing dies.



F. KRAUSE. METHOD AND APPARATUS FOR MAKING WIRE DRAWING 1112sAPPLICATION FILED DEC. 22, 1911.

Patented Mar. 18,1913.

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To all whom it may concem: Be it known that I, FREDERICK KuAU-sn, acitizen of the Empire of Germany-{and aresident of J erse City, countyof Hudson, State;of-' New ersey, have invented certain new andusefulImprovements in Methods and Ap aratu's for Making Wire-Drawing Dies,"owhich the followingis a spec 1fi cation,';-- f I, .This:inv'entionrelates to an improved method' ofand apparatus for makingwire drawing die's."

Heretofore the casting of mantles around precious-stones, preferablydiamonds, was .efiected v direction of its boring upon one or between I.two broad plates to hold same in position while cast-in a ring ofmetal, such. as 'steel or nic el alloy around it, and to 2DconductawayIfromthe stone the high fusion 'heatfof the metal of whichthe setting 7 is com os'edr iWiredrawing diesproduced according to itheabove, mentioned method are deficient 'in that the diamond, during the.operationof drawing the wire does not have any 'supp'ort inthedirection of its hor- 3' mg because the outer side of the boring is iee from supporting material. therefore,

he diamond itself has to hear the entire. 80 train of the drawing of thewire. .This

guite often results inc splintering. of the iamond around the opening ort tearing outparticles at that side of. the boring where the wire leavesthe die.

5 It is the purpose of the present invention to overcome the describeddeficiencies and produce a wire drawing die whose stone is provided witha metallic mantle cast around it so that practically the boring alone is0 left free. Thus the stone has a strong support on part of the mantleduring the drawing of the wires. To attain this purpose, the

stone must be held between two conical pointed rods within the mold.

5 Practice has shown that these pointed supporting rods fuse to the castmetal owing to the high fusion temperature of the latter, particularlywhen steel or nickel alloys are used. Such fusion takes place especiallyon the thin pointed ortions of the rods closely to the'stone. The boringof the stone later becomes very difficult and the fused portions ofmetal near the stone are hard to openwhereby thestone is injured in mostinstances. insulation of the thin pointed iusrnonsrm 'APPARATU'S mamam'mwmE-nmwme DIES.

' Specification Of LettersPatent. vPatented Mar.18,19.13."ApplicationfiledDeceniher22;1911;. SerialNo.6t3'L842.

by supporting the diamond in the scribed hereinafter. I I Thepresentjinvention is illustrated in the portions of the supporting ,rodswith a re- I 1 -.fractory coating of clay or the like is not reliableThe insulating mass does not ed rods, but fallsrofi or is' by theflowing meta-1. I-n, t; is-manner the cast mantle .will containimpurities and a. f partial fusion of the mantle and the supporting rods.ma take place, Furthermore, I experience has s own that the v holdingrodsare not suflicient y in contact stick uniformly to all portions-ofthe poiut-v 4 i a1'tly 1 'emo\'ed with thestone, which results inan'imperfect 1 a conduction of the heat therefrom. Under 1; 1 thesecircumstances the boring of the stone oints of thea sufi'ers because theopening thereinisrough and shows minute cracks.

, For the purpose of avoiding-the described ,1 f. deficiencies I haveinvented'the method, and 1 apparatus for carrymg same'intoefi'ect, de-

accom an in" drawin m which:

y a g Figure 1 represents in vertical central sec- ,5

tion on line 1. -1 of 3 a'n apparatus for" present method may be carriedout, Eig. is a sideelevation of Fig. 3. Fig, 3 a

making wire drawing diesin which ,t-heeh 1" i plan view, and Fig.tillustrates .in centra lfi i sectional view on an enlar ed scale thestone with the metal cast aroun it. 8.5

Similar characters of reference denote like parts in all the figures.

One of the novel features of the present invention consists in the useof fine metal tubes having more or less thin walls inplace of the solidrods heretofore employed. Y These tubes do not require any insulationand may fuse or weld to the'cast metal but, leave the boring of thestone free. This-renders it possible to finishthe opening in the castingwithout ditiiculty and without injury to the stone, said opening beinpreferabl made conical as shown in- %ig. v4. In a dition thereto thearrangement of the.

device is such thatthe mantle may be cast around the stone while sameism a hori zontal position which permits of a circulation of air throughthe tubes during and aft-er casting, whereby a sufiicient cooling in theinterior of the stone, particularly in the neighborhood of-the opening,is eifected. 1; is' evident that the hot air rises and, thereore, takeplace during the process of casting, because the tubes are mounted in avertical 1 a continuous circulation of air 'will i I 6. In an ipp'arat us for producing wire Signed at Nw. Yoik, N. Y., this 21st day i drawingdies anexchangeable ringwith |0f Decembei'1911. j

mold opening, two small cubes extending into said mold openings andadapted to sup- FREDERICK B SE 5 port a bored diamond in a horizontalposi- Witnesses:

tion, and means for supporting said ex- BRAU'N,

changeable ring. i MARIE H. LEHB.

